Only about 20 to 30 percent of the Chicago metro area likely will see afternoon storms, as high temperatures continue to trend below-average in the mid- to upper-70s. By Friday night, conditions become more humid, and scattered showers and storms are likely at times across the area.

Rain continues into early Saturday before the day turns cloudy, much warmer and more humid by the afternoon.

Showers and thunderstorms are expected to develop by late afternoon. Some storms could be severe with damaging wind, large hail and heavy rain through the evening and at night, mainly along and south of the I-80 corridor. Extreme Weather Photos: Malaysia Floods
High temperatures could reach 90 degrees with a heat index in the mid-90s.

Periodic showers and storms are expected to persist through a warm Sunday afternoon with highs in the low 80s.